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Product Detailed Parameters
- Description：IC FF D-TYPE DUAL 1BIT 14DIP
- Series：74LS
- Mfr：onsemi
- Package：Tube
- Function：Set(Preset) and Reset
- Type：D-Type
- Output Type：Complementary
- Number of Elements：2
- Number of Bits per Element：1
- Clock Frequency：20 MHz
- Max Propagation Delay @ V, Max CL：35ns @ 5V, 50pF
- Trigger Type：Positive Edge
- Current - Output High, Low：400µA, 8mA
- Voltage - Supply：4.75V ~ 5.25V
- Current - Quiescent (Iq)：8 mA
- Operating Temperature：0°C ~ 70°C (TA)
- Mounting Type：Through Hole
- Supplier Device Package：14-MDIP
- Package / Case：14-DIP (0.300", 7.62mm)
- Input Capacitance：-
- Grade：-
- Qualification：-
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Overview
The DM74LS74AN is a dual D-type flip-flop integrated circuit manufactured by onsemi, belonging to the 74LS logic series. It features two independent positive-edge-triggered flip-flops with separate data (D), clock (CLK), preset (PRE), and clear (CLR) inputs. The device utilizes TTL-compatible input and output logic levels, operates within a supply voltage range of 4.75V to 5.25V, and supports through-hole mounting in a 14-pin Mini-DIP package.
Feature Summary
- Dual independent D-type flip-flops with positive-edge triggering
- Asynchronous active-low preset and clear control inputs
- TTL-compatible input and standard TTL output logic levels
Applications
- Digital data storage and register circuits
- Frequency division and counter stages
- Synchronization of asynchronous signals
Procurement Notes
Verify component authenticity against official onsemi documentation. Confirm the specific part number suffix matches the required package type. Check for RoHS compliance status as older manufacturing runs may differ from current standards. Ensure the supplier provides valid traceability records for quality assurance purposes.
Selection Notes
Select this component when dual D-type flip-flops are required in a legacy 74LS architecture. It is suitable for designs needing TTL compatibility and through-hole assembly. Consider pinout compatibility with existing PCB layouts designed for standard 14-pin DIP packages. Evaluate thermal requirements against the commercial operating temperature range.
Part Context
This component is part of the broader 74LS family of bipolar logic devices known for high-speed operation relative to standard LS logic. The DM prefix indicates it is manufactured by onsemi. It serves as a fundamental building block for sequential logic circuits in industrial and consumer electronics applications requiring reliable state retention.
Replacement Considerations
Direct substitutes include SN74LS74AN from Texas Instruments. Other compatible alternatives may exist from manufacturers producing equivalent 74LS series dual D-flip-flops in 14-pin DIP packages.
